$OpenBSD: patch-libs_pbd_mountpoint_cc,v 1.1 2017/05/25 09:02:05 espie Exp $
get free from somewhere

Index: libs/pbd/mountpoint.cc
--- libs/pbd/mountpoint.cc.orig
+++ libs/pbd/mountpoint.cc
@@ -95,6 +95,7 @@ mountpoint (string path)
 #include <sys/param.h>
 #include <sys/ucred.h>
 #include <sys/mount.h>
+#include <stdlib.h>
 
 string
 mountpoint (string path)
